The rectangular tile this is based on can be had by selecting the rectangle in Inkscape and using shift+alt+i
Source Firkin
Background formed from the iconic plastic construction bricks that gave me endless hours of fun when I was a lad.
Source Firkin
I love these crisp, tiny, super subtle patterns.
Source Badhon Ebrahim
Number five from the same submitter, makes my job easy.
Source Dima Shiper
A seamless pattern formed from a square tile. The tile can be retrieved by selecting the rectangle in Inkscape and using shift-alt-i.
Source Firkin
Tiny little fibers making a soft and sweet look.
Source Badhon Ebrahim
Looks like an old rug or a computer chip.
Source Patutin Sergey
Abstract Stars Geometric Pattern Prismatic No Background
Source GDJ
Has nothing to do with toast, but it’s nice and subtle.
Source Pippin Lee
Seamless tile drawn in Paint.net and vectorised in Vector Magic.
Source Firkin
From a drawing in 'Navigations de Alouys de Cademoste.-La Navigation du Capitaine Pierre Sintre', Alvise da ca da Mosto, 1895.
Source Firkin
Design drawn in Paint.net, vectorised using Vector Magic and finished in Inkscape.
Source Firkin
Prismatic Curved Diamond Pattern 7 No Background
Source GDJ
Simple combination of stripy squares with their negatively coloured counterparts
Source Firkin
Beautiful dark noise pattern with some dust and grunge.
Source Vincent Klaiber
Abstract Geometric Monochrome Pattern Prismatic No Background
Source GDJ
Here's a seamless brown cork board background texture. Feel free to download or reshare if you like.
Source V. Hartikainen
Remixed from a drawing in 'Line and form', Walter Crane, 1914.
Source Firkin